1.	Express 7-3 using positive exponents.
		A.	(-7)3	B.
		C.		D.
		Hint
	2.	Write using negative exponents.
		A.	-2-4	B.	-24
		C.	2-4	D.	2-3
		Hint
	3.	Write the expression 5-4 using a positive exponent.
		A.	54	B.	-54
		C.		D.
		Hint
	4.	Write the expression m-7 using a positive exponent.
		A.		B.	m7
		C.	-m7	D.
		Hint
	5.	Evaluate x-4 if x = 3.
		A.		B.
		C.	81	D.	-81
		Hint